Queuing Models in NS2

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M/M/1 is a system with poisson arrival time, servicing exponentially and a queue of unlimited capacity and type of FIFO Queue. This is the simplest queuing system.  NS2 supports various distributions like pareto, exponential, constant, unifrom, etc to handle the network dynamics and metrics. So it is very easy to test the given network link to monitor a given queue using any of these queuing models. The listing 3 and 4 are monitoring the link when DropTail queue is used with a capacity of finite and infinite. Listing 13.3 uses infinite capacity and Listing 13.4 uses Finite capacity The output screen shot is shown below the scripts for further understanding
Listing 3 – M/M/1 Queuing Model #new Simulator creation set ns [new Simulator] #trace file creation for capturing the UDP data set tf [open out.tr w] $ns trace-all $tf
#setting the exponential distribution param set lambda 30.0 set mu     33.0
#creation of nodes set n1 [$ns node] set n2 [$ns node] #The queue limit is 1Lakh as the capacity is infin…

How to install C++ and other libraries in Ubuntu

For any software development work in ubuntu, some software packages are needed. For example C/C++ will be needed by almost all the developmental work

how to install the required libraries and needed softwares for development, here are the steps 

You create a password for the super user

sudo passwd

Give the password of the default user and then give the root password twice.

Once you install Ubuntu (any distro), just update the softwares by the following command:

sudo apt-get update

sudo apt-get install build-essential libxmu-dev 

(the above line will install softwares of size nearly 56MB)

This will install latest G++ compiler along with other developmental libraries.

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